feat(example): 新增飞行控制 C 示例项目

- 提供传感器、滤波、控制律和执行器等模块化示例
- 包含约 35 个函数用于代码分析与文档生成流程测试
- 使用 Makefile 支持最小化编译验证

src/control.c

@@ -0,0 +1,34 @@
+#include "flight_app.h"
+
+void Control_Init(CommandState *command) {
+    command->target_speed = 200.0f;
+    command->target_altitude = 2500.0f;
+    command->pitch_limit = 10.0f;
+    command->auto_mode = 0U;
+}
+
+float Control_ComputeSpeedError(const CommandState *command, const SensorData *data) {
+    return command->target_speed - data->air_speed;
+}
+
+float Control_ComputeAltitudeError(const CommandState *command, const SensorData *data) {
+    return command->target_altitude - data->altitude;
+}
+
+float Control_PidStep(float error, float gain, float limit) {
+    float output = error * gain;
+    if (output > limit) {
+        return limit;
+    }
+    if (output < -limit) {
+        return -limit;
+    }
+    return output;
+}
+
+void Control_Update(const CommandState *command, const SensorData *data, ActuatorState *actuator) {
+    float speed_error = Control_ComputeSpeedError(command, data);
+    float altitude_error = Control_ComputeAltitudeError(command, data);
+    actuator->throttle = Control_PidStep(speed_error, 0.01f, 1.0f);
+    actuator->elevator = Control_PidStep(altitude_error, 0.002f, command->pitch_limit);
+}